Job Information Level 2: Lesson 3 Working Properly With Aluminum Conductors

Question 1

When preparing to strip insulation in order to splice conductors, a person should strip the insulation back far enough so that the conductor goes fully into the connector and that the insulation ? the connector.
Select one:

a.
fits closely to

b.
fits inside

c.
fits partway into

d.
is kept far away from

Answer 1

fits closely to

Question 2

During the setup process of wire pulling (when making up a pulling head for a wire pull), conductors are laid in a ? position when making a rope pull to allow maximum ? around bends.
Select one:

a.
parallel / capacity

b.
parallel / flexibility

c.
staggered / capacity

d.
staggered / flexibility

Answer 2

staggered / flexibility

Question 3

When the setup process of wire pulling includes three single conductors, one each from three separate reels, these reels should be ? so as to maintain equal pulling tension. This prevents conductors from crossing and jamming within the raceway.
Select one:

a.
parallel with one another

b.
staggered one behind the other

c.
straight behind one another

d.
two in parallel and one in series, right behind either one of the parallel reels

Answer 3

staggered one behind the other

Question 4

You are bending and terminating an aluminum TYPE SER cable that measures 1.601 inch OD (outside diameter). The insulation thickness of one of the conductors is 0.068 inch. What is the minimum allowable bending radius?
Select one:

a.
6.404

b.
8.005

c.
9.606

d.
11.207

Answer 4

8.005

1.601 inch × 5 = 8.005 inch radius (min.)
Note: These numbers are based on a 3/C + gnd, TYPE SER w/250 kcmil.

Question 5

Name the two basic types of pressure connectors.

I. Compression-type (applied with a tool and die)
II. Mechanical screw-type
III. Solder-type
IV. Twist-on-type
Select one:

a.
I. and III.

b.
I. and II.

c.
I. and IV.

d.
Only I.

Answer 5

I. and II.

Question 6

What NEC Article should be followed to determine the maximum allowable number of wires or cables permitted in cable trays?
Select one:

a.
Article 110

b.
Article 310

c.
Article 376

d.
Article 392

Answer 6

Article 392

Note: Review NEC Section 90.3.

Question 7

A coating of joint compound on the surface of a conductor, prevents a(n) ? from reforming after the installation process.
Select one:

a.
coating

b.
film

c.
oxide

d.
skin

Answer 7

oxide

Question 8

Only pressure-type connectors marked ? to indicate that they have been tested and are listed by UL should be used interchangeably to connect aluminum, copper, and aluminum to copper connections.
Select one:

a.
AL7 or AL9

b.
AL7CU or AL9CU

c.
CU7 or CU9

d.
ZMVV

Answer 8

AL7CU or AL9CU

Question 9

Belleville spring washers are not required to be used with which type of bolts or threaded studs?
Select one:

a.
Aluminum only

b.
Aluminum and steel only

c.
Copper and bronze only

d.
Copper, bronze, and steel only

Answer 9

Aluminum only

Question 10

Select two means of connecting aluminum feeders to equipment listed only for copper connections.

I. A “gutter-splice” using an AL7CU or AL9CU compression connector
II. Listed AL7CU or AL9CU adapter fittings – designed for the purpose
III. Listed twist-on adapter fittings
IV. Using an approved Al/Cu copper sleeve

Select one:

a.
I. and II.

b.
I. and III.

c.
III. and IV.

d.
II. and IV.

Answer 10

I. and II.

Question 11

You are terminating a 750 kcmil aluminum conductor to a copper or bronze pad. Which of the following is a material or component that you will not need?
Select one:

a.
One two-hole plated aluminum compression lug

b.
Two steel or bronze bolts

c.
Two steel Belleville washers

d.
Two steel nuts

e.
Four flat steel washers

f.
Listed joint compound

g.
Silicon spray

h.
All of these materials and components are needed.

Answer 11

All of these materials and components are needed.

Question 12

What temperature rating is associated with grounding clamps?
Select one:

a.
60°C

b.
75°C

c.
90°C

d.
No temperature rating is associated with grounding clamps.

Answer 12

No temperature rating is associated with grounding clamps.

Question 13

What tightening torque should be used for a hexagonal head screw (not split-bolt) on a 250 kcmil conductor?
Select one:

a.
50 inch-pounds

b.
250 inch-pounds

c.
325 inch-pounds

d.
650 inch-pounds

Answer 13

325 inch-pounds

Question 14

The overall voltage drop should not exceed ? for feeders and branch circuits together.
Select one:

a.
3%

b.
4%

c.
5%

d.
10%

Answer 14

5%

Question 15

To avoid unduly stressing the conductors during installation, ensure that ? to provide a steady tension on the cables and avoid jerks.
Select one:

a.
cable reels are set up side by side (parallel)

b.
cable reels are set up straight behind one another

c.
pull rope is long enough

d.
pulling equipment is of adequate power

Answer 15

pulling equipment is of adequate power

Question 16

When pulling aluminum cable around bends in cable support trays, ? should be used to reduce the required pulling tensions and to prevent damage to the wires or cables.
Select one:

a.
large radius sheaves

b.
pulling compound

c.
small radius sheaves

d.
“tuggers”

Answer 16

large radius sheaves

Question 17

During the process of terminating aluminum conductors in a mechanical screw-type connector, and after stripping the insulation off the conductor, the installer should ? the conductor and apply a(n) ? on the exposed aluminum conductor(s).
Select one:

a.
rub / Vaseline

b.
scrape / a wire compound

c.
strip / approved aluminum joint compound

d.
wire brush / listed aluminum joint compound

Answer 17

wire brush / listed aluminum joint compound

Question 18

Most ? are supplied by the manufacturer already filled with joint compound to seal the connector from moisture and other contaminants.
Select one:

a.
compression connectors

b.
set screw connectors

c.
split-bolt connectors

d.
twist-on connectors

Answer 18

compression connectors